docs: def memcache(self, f):
          """Cache a function in memory using an internal dictionary."""
          name = _fullname(f)
          cache = self.load_memcache(name)
  
          @wraps(f)
          def memcached(*args):
              """Cache the function in memory."""
              # The arguments need to be hashable. Much faster than using hash().
              h = args
              out = cache.get(h, None)
              if out is None:
                  out = f(*args)
                  cache[h] = out
              return out
          return memcached